[PATCH v2 net-next 10/16] net: aquantia: introduce fwreq mutex

[Igor Russkikh]

From: Nikita Danilov <ndani...@aquantia.com>

Some of FW operations could be invoked simultaneously,
from f.e. ethtool context and from service service activity work.
Here we introduce a fw mutex to secure and serialize access
to FW logic.

Signed-off-by: Nikita Danilov <ndani...@aquantia.com>
Signed-off-by: Igor Russkikh <igor.russk...@aquantia.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_nic.h      | 2 ++
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h 
b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
index 0409cf5ca3ab..be56ace6274b 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
@@ -105,6 +105,8 @@ struct aq_nic_s {
        struct pci_dev *pdev;
        unsigned int msix_entry_mask;
        u32 irqvecs;
+       /* mutex to serialize FW interface access operations */
+       struct mutex fwreq_mutex;
        struct aq_hw_rx_fltrs_s aq_hw_rx_fltrs;
 };
 
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c 
b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
index 961e9777e66b..a607e25dfbff 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -231,6 +231,8 @@ static int aq_pci_probe(struct pci_dev *pdev,
        SET_NETDEV_DEV(ndev, &pdev->dev);
        pci_set_drvdata(pdev, self);
 
+       mutex_init(&self->fwreq_mutex);
+
        err = aq_pci_probe_get_hw_by_id(pdev, &self->aq_hw_ops,
                                        &aq_nic_get_cfg(self)->aq_hw_caps);
        if (err)
-- 
2.17.1